Molecular Geometry in an Excited Electronic State and a Preresonance Raman Effect

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Science  25 Apr 1975:
Vol. 188, Issue 4186, pp. 359-361
DOI: 10.1126/science.188.4186.359


Observations of Raman spectra of various molecules at different exciting laser wavelengths lead to an empirical rule. If a Raman line becomes stronger when the exciting frequency is brought closer to the frequency of an electronic band, this means that the equilibrium conformation of the molecule is distorted along the normal coordinate for the Raman line in the transition from the ground to the excited electronic state.